Update README.md

## **Update the component**

The component will check for updates each time HA is restarted. When there is a new version, a Persistent Notification will appear.

Use the services `smartir.check_updates` to manually check for updates and `smartir.update_component` to start the automatic update.

If you would like to get update notifications from the rc branch, configure SmartIR as follows:

```yaml

smartir:

  update_branch: rc

```

## Links

* [SmartIR Chat on Telegram](https://t.me/smartHomeHub)